Drive circuit unit

Abstract

In a drive circuit unit, a seal member includes a first contact part that makes contact with respect to an inner surface of a case wall section which defines a through hole. In a state in which the seal member is arranged inside the through hole, a first distance in an insertion direction of the seal member from an outside end portion of the inner surface to the first contact part is longer than a second distance in the insertion direction between an outside surface of the seal member and a cover.

What is claimed is: 
     
       1. A drive circuit unit comprising:
 a drive circuit configured to convert or adjust electric power from a power source and supply the converted or adjusted electric power to a motor, wherein the drive circuit comprises a plurality of terminals; 
 a case in which the drive circuit is accommodated, the case having a case wall section in which a plurality of through holes are formed; 
 a plurality seal members, wherein a seal member of the plurality of seal members is configured to seal a through hole of the plurality of through holes; and 
 a cover configured to arranged across, on a more outer side of the case wall than the seal member, the plurality of seal members in an insertion direction of the seal members; 
 wherein each of the seal members of the plurality of seal members includes a first contact part configured to make contact with respect to an inner surface of the case wall section, the inner surface defining the plurality of through holes; and 
 in a state in which the seal member of the plurality of seal members is arranged inside the respective through hole of the plurality of through holes, a first distance in the insertion direction from an outside end portion of the inner surface to the first contact part is longer than a second distance in the insertion direction between an outside surface of the seal member of the plurality of seal members and the cover. 
 
     
     
       2. The drive circuit unit according to  claim 1 , wherein the seal member of the plurality of seal members further includes a second contact part configured to make contact with respect to the inner surface of the case wall section. 
     
     
       3. The drive circuit unit according to  claim 2 , wherein:
 each seal member of the plurality of seal members comprises: 
 an insert part configured to be inserted into the through hole of the case wall section; and 
 a flange configured to make contact with the outside surface of the case wall section; and 
 the insert part comprises: 
 an insert base portion having a contour smaller than a contour of the through hole; and 
 the first contact part and the second contact part, which project from the insert base portion and have a contour larger than the contour of the through hole. 
 
     
     
       4. The drive circuit unit according to  claim 1 , wherein the seal member of the plurality of seal members further includes a third contact part configured to make contact with an inside surface of the case wall section, in a state in which the seal member of the plurality of seal members is arranged inside the through hole. 
     
     
       5. The drive circuit unit according to  claim 1 , wherein the plurality of seal members includes a force receiving surface configured to receive a pressing force of an interior portion of the case, on a more inner side of the case than the respective through hole of the plurality of through holes. 
     
     
       6. The drive circuit unit according to  claim 3 , wherein the flange of each of the seal members comprises an outer circumferential projection that projects toward the outside surface of the case wall section in the insertion direction of the seal member, and makes contact with the outside surface.